The Shared Scientific Toolbox is a library that facilitates development of efficient, modular, and robust scientific/distributed computing applications in Java. It features multidimensional arrays with extensive linear algebra and FFT support, an asynchronous, scalable networking layer, and advanced class loading, message passing, and statistics packages.

The dANN project is a library to help facilitate artificial neural networks, artificial intelligence, and artificial genetics within other applications. It is currently written in Java, C++, and C#. However, only the Java version is currently in active development. The other versions can only be obtained from SVN. It provides a powerful interface for programs to include conventional artificial intelligence technology and artificial genetics into their code. It also acts as a testing ground for research and development of new concepts.

jniThreadCPUUsage is a Java library to get the amount of user and system CPU time used per thread. This is done via JNI, which calls getrusage() on the system. getrusage() is only available on Linux 2.6.26 or later and Solaris. One useful application of this is measuring the amount of CPU time used for a servlet request. getrusage() CPU time reporting is better than using the real time clock because it measures actual CPU time used and disregards times when the thread is idle or waiting (such as when it is waiting for network I/O).

SDLbits is a very lightweight SDL wrapper for Java. This library was designed to be very small and simple. It does not use Swig, but goes directly from "native" Java definitions to the sdlbits C wrapper library to SDL or OpenGL (in C). All symbols are exposed as they would be in C, except the "SDL_" prefix has been removed, since all names are inside the SDL class. The SDL structures from C are translated to very simple Java classes, such as SDL.VideoInfo. Most fields are exposed as read-only "get" methods, but "set" methods for writable members are supported as well. These classes simply interface to the actual C data with a ByteBuffer "pointer".

usb4java is a Java library for accessing USB devices. It is based on the native libusb 1.0 library and uses Java NIO buffers for data exchange between libusb and Java. It also supports the javax-usb standard (JSR-80) through the usb4java-javax extension. Supported platforms are Linux (x86 32/64-bit, ARM 32-bit), OS X (x86 32/64-bit), and Windows (x86 32/64-bit). Other platforms may work as well (as long as they have at least Java 6 and are supported by libusb) by compiling the JNI library manually.

JavaAutotoolsExample is an example of a Java Swing program that uses GNU Gettext, Autoconf, Automake, Make, and Java JNI. JavaAutotoolsExample is intended to help Java developers and maintainers make their full-featured Java programs respect the standard "./configure && make && sudo make install" procedure for build and installation.

CASampledSP is a JNI-based service provider for the javax.sound.sampled.spi interfaces. As such it is capable of decoding many popular audio formats (like mp3 and aac) at native speed taking advantage of Apple's CoreAudio library. The focus is currently on decoding and converting to LPCM, not on writing or exporting.

Cumulix is a cloud-based image search and retrieval system that utilizes pHash Pro for image similarity and runs on top of Neo4j to provide fault tolerance and scalability. Cumulix is capable of storing millions of images with minimal performance degradation.